.ka {
    width: 200px;
    height: 300px;
    float: left;
    margin: 0 30px;
    box-shadow: #ACACAC 5px 5px 6px 0px;
    cursor: pointer;
}
.ka:hover{
    transition:box-shadow 0.5s;
}

.ka p {
    color: white;
    text-align: center;
    text-shadow: black 0 1px 0;
    line-height: 100px;
    margin-bottom: 20px;
}

.card{
    width: 1500px;
    margin: 0 auto;
}
/*字体*/
.f23 {
    font-size: 23px;
}
.f60 {
    font-size: 60px;
}

/*颜色*/
.blue {
    background: #49A1FD
}
.red {
    background: #E74E4E
}
.violet{
    background: #DD40CE
}
.green{
    background: #00a652;
}
.yellow{
    background: #ff703c;
}